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Swift: Add Sign In With Apple example (#6927)
* Swift example using Sign In With Apple for AWS This adds a new example that uses Sign In With Apple to authenticate to AWS, then display a list of the Amazon S3 buckets the user has available. The user interface is presented using SwiftUI, and the application works on macOS, iOS, and iPadOS. * Use SimpleKeychain to save local data This update switches from using the unencrypted SwiftUI `@AppStorage` to using Auth0's `SimpleKeychain` library to save the user account information locally.
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‎swift/example_code/apple/Buckets/Buckets.xcodeproj/project.pbxproj‎

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‎swift/example_code/apple/Buckets/Buckets.xcodeproj/project.xcworkspace/contents.xcworkspacedata‎

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‎swift/example_code/apple/Buckets/Buckets.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist‎

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>IDEDidComputeMac32BitWarning</key>
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<true/>
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</dict>
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</plist>

‎swift/example_code/apple/Buckets/Buckets.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings‎

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict/>
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</plist>

‎swift/example_code/apple/Buckets/Buckets/Assets.xcassets/AccentColor.colorset/Contents.json‎

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{
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"colors" : [
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{
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"idiom" : "universal"
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}
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],
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"info" : {
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"author" : "xcode",
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"version" : 1
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}
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}

‎swift/example_code/apple/Buckets/Buckets/Assets.xcassets/AppIcon.appiconset/Contents.json‎

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{
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"images" : [
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{
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"idiom" : "universal",
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"platform" : "ios",
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"size" : "1024x1024"
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},
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{
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"idiom" : "mac",
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"scale" : "1x",
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"size" : "16x16"
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},
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{
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"idiom" : "mac",
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"scale" : "2x",
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"size" : "16x16"
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},
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{
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"idiom" : "mac",
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"scale" : "1x",
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"size" : "32x32"
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},
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{
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"idiom" : "mac",
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"scale" : "2x",
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"size" : "32x32"
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},
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{
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"idiom" : "mac",
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"scale" : "1x",
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"size" : "128x128"
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},
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{
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"idiom" : "mac",
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"scale" : "2x",
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"size" : "128x128"
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},
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{
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"idiom" : "mac",
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"scale" : "1x",
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"size" : "256x256"
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},
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{
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"idiom" : "mac",
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"scale" : "2x",
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"size" : "256x256"
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},
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{
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"idiom" : "mac",
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"scale" : "1x",
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"size" : "512x512"
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},
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{
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"idiom" : "mac",
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"scale" : "2x",
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"size" : "512x512"
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}
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],
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"info" : {
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"author" : "xcode",
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"version" : 1
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}
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}

‎swift/example_code/apple/Buckets/Buckets/Assets.xcassets/Contents.json‎

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{
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"info" : {
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"author" : "xcode",
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"version" : 1
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}
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}

‎swift/example_code/apple/Buckets/Buckets/Buckets.entitlements‎

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>com.apple.developer.applesignin</key>
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<array>
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<string>Default</string>
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</array>
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<key>com.apple.security.app-sandbox</key>
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<true/>
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<key>com.apple.security.files.user-selected.read-only</key>
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<true/>
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<key>com.apple.security.network.client</key>
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<true/>
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</dict>
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</plist>

‎swift/example_code/apple/Buckets/Buckets/BucketsApp.swift‎

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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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import SwiftUI
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/// The main SwiftUI entry point.
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@main
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struct BucketsApp: App {
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var body: some Scene {
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WindowGroup {
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ContentView().environmentObject(ViewModel())
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}
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}
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}

‎swift/example_code/apple/Buckets/Buckets/BucketsAppError.swift‎

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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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import Foundation
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/// Represents errors that need to be handled or reported to the user.
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enum BucketsAppError: Error, LocalizedError {
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/// Sign In With Apple request failed.
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case signInWithAppleFailed
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/// Sign In With Apple was canceled by the user.
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case signInWithAppleCanceled
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/// The `AssumeRoleWithWebIdentity` request failed.
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case assumeRoleFailed
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/// The credentials returned by Sign In With Apple is missing
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/// required information.
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case credentialsIncomplete
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/// The authentication request failed.
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case credentialsFailed
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/// The `ListBuckets` request did not successfully return a list
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/// of Amazon S3 buckets.
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case bucketListMissing
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/// The token file could not be written to storage.
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case tokenFileError(reason: String = "Unable to create the token.")
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var errorDescription: String? {
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switch self {
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case .signInWithAppleFailed:
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return "Unable to sign into AWS"
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case .signInWithAppleCanceled:
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return "Sign in canceled"
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case .assumeRoleFailed:
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return "Unable to access AWS S3"
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case .credentialsIncomplete:
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return "Unable to authenticate"
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case .credentialsFailed:
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return "Invalid web token"
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case .bucketListMissing:
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return "Unable to access AWS S3"
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case .tokenFileError:
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return "Token error"
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}
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}
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/// A human-readable error message string corresponding to the
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/// error returned.
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var recoverySuggestion: String? {
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switch self {
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case .signInWithAppleFailed:
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return "Sign In With Apple returned an error."
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case .signInWithAppleCanceled:
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return "User did not authenticate."
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case .assumeRoleFailed:
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return "The role could not be assumed using the web token returned by Sign In With Apple."
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case .credentialsIncomplete:
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return "The credentials returned by AssumeRoleWithWebIdentity are incomplete."
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case .credentialsFailed:
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return "An error occurred while attempting to retrieve credentials from AWS."
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case .bucketListMissing:
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return "Amazon S3 did not return a valid bucket list."
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case .tokenFileError(let reason):
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return "An error occurred with the local Sign In With Apple token: \(reason)"
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}
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}
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}

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